Winding stop motion for textile winding machines

ABSTRACT

Winding stop motion for textile machines having a fluid pressure control relay mounted in the area of the yarn winding being formed. The relay is connected to a source of pressure fluid, usually air, and to a pressure responsive means. Such means is actuated, upon a predetermined approach of the surface of a winding being formed upon a bobbin, to produce a signal which stops the winding operation. The relay detects the approach of the winding surface thereto by means of a discharge nozzle which may coact directly with the surface of the winding or may coact with a feeler which itself engages the yarn winding. In a further embodiment, the discharge nozzle is provided with a valve which is actuated when the diameter of the bobbin being wound reaches a predetermined desired value.

United States Patent [191 Sedlarik 1 Jan. 15, 1974 WINDING STOP MOTION FOR TEXTILE WINDING MACHINES [75] Inventor: Jaroslav Sedlarik, Liberec,

Czechoslovakia [73] Assignee: ELITEX, Zavody Textilnino Strojirenstvi Generalni Reditelstvi,

Related US. Application Data [63] Continuation-impart of Ser. No. 12,748, Feb. 19,

1970, abandoned.

[30] Foreign Application Priority Data 2,667,311 1/1954 Packer et al 242/75.43

2,964,440 12/1960 Stevens 242/75.43 3,164,333 1/1965 Robertson. 242/7543 3,312,415 4/1967 Jeans 242/75.43

FOREIGN PATENTS OR APPLICATIONS 1,192,766 4/1959 France 242/39 Primary ExaminerStanley N. Gilreath Attorney-Arthur O. Klein 2 .[57] ABSTRACT I Winding stop motion for textile machines having a fluid pressure control relay mounted in the area of the yarn winding being formed. The relay is connected to a source of pressure fluid, usually air, and to a pressure responsive means. Such means is actuated, upon a predetermined approach of the surface of a winding being formed upon a bobbin, to produce a signal which stops the winding operation. The relay detects the approach of the winding surface thereto by means of a discharge nozzle which may coact directly with the surface of the winding or may coact with a feeler which itself engages the yarn winding. In a further embodiment, the discharge nozzle is provided with a valve which is actuated when the diameter of the bobbin being wound reaches a predetermined desired value.

10 Claims, 7 Drawing Figures PAIENTEU 3.785.581

sum 1' or 2 INVENTORJ JiRosuN SEDLAKAL ATTOR N EY WINDING STOP MOTION FOR TEXTILE WINDING MACHINES I This application is a continuation-in-part of application Ser. No. 12,748, filed Feb. 19, 1970, now abandoned.

The present invention relates to a winding stop motion fo textile machines, particularly automatic winding machines. Such stop motion is mounted in the area of the yarn winding being formed and is provided with a yarn feeler.

During yarn winding operations it is desirable to maintain the quantity of yarn wound on the bobbins at the separate winding units as uniform as possible, from bobin to bobin to avoid excessive waste during further processing of. the yarn from these bobbins.

The same quantity, that is, the same lenght of the rewound yarn, is secured at present by stop motions or similar mechanisms of many various types which usually respond to a certain change of inclination of the bobbin carrier caused by the corresponding increase of diameter of the yarn winding on the bobbin.

Other type of stop motions operate in response to the displacement of a feeler which, during the whole time of winding, follows the increase of the yarn winding on the bobbin. Such mechanism, upon its preadjusted displacement emits an impulse, by means of contacts, for the purpose of stopping the winding unit.

Sensitivity of the known stop motion types is limited by the tolerances and inaccuracies due to manufacture of parts on which the said stop motions are mounted; further, the full bobbin presses with its great weight against the yarn distributor, the bobbin frame being thus distorted and giving rise to new, difficultly controllable differences, which seriously detract from the accuracy of the size of the yarn winding finally produced on the bobbin.

The present invention has for its object the provision of novel mechanism which decreases the differences of the quantity of yarn wound on the separate bobbins. Briefly, the mechanism employs a control relay attached to the yarn feeler, said relay having the form of the fluid pressure distributor having a discharge port closely confronting a yarn winding feeler member. A fluid pressure difference reader, that is, a pressure responsive means, is attached to said control relay, which is connected to the working fluid source, the difference reader is connected to stop the winding operation upon the winding of a predetermined desired amount of yarn on the bobbin.

Further advantages and features of the present invention will be understood as they are further described in the following specification and shown in the accompanying drawings, of which:

FIG. 1 shows somewhat diagrammatically a winding stop motion in cross-section with control mechanism -including a pressure difference reader, a bobbin driving means, and a control means for the driving means controlled by the pressure difference reader;

FIG. 2 shows another embodiment of the winding stop motion system in a manner similar to FIG. 1;

FIG. 3 is a fragmentary, somewhat schematic view of still another embodiment of winding stop motion in accordance with the invention;

FIG. 4 is a diagrammatic view showing the arrangement of the winding stop motion on a bobbin frame;

FIG. 5 is a detail view partially in elevation and par tially in section of the pressure difference reader employed in the first-described embodiment of the invention; 7 v

FIG. 6 is a view in diametral axis section through the clutch controlled by the pressure difference reader; and

FIG. 7 is a detailed view partially in elevation and partially in section of the pressure difference reader employed in the second described embodiment of the in ent ons.

The winding stop motion according to the embodiment of the present invention shown in FIG. 1 consists substantially of a control relay 1 in'the form of a fluid pressure distributor, which is provided with at least one discharge nozzle closely confronting an attached yarn winding feeler 3. Feeler 3 is formed advantageously by a flat spring fastened at its root to the basic body of the control relay 1; the feeler is so arranged as to maintain between said feeler 3 and the discharged nozzle of the control relay a certain distance range X, within the limits of which a control of the pressure of the working fluid passing therethrough takes place by movement of the feeler. The control relay 1 is provided with an inlet opening 6 provided with a diaphragm 7 for the inlet of the working fluid, which is e.g., pressure air. The control relay 1 has further a pressure difference reader 8 attached thereto, e. g., a pneumo-electrical transformer by which amplified impulses are emitted after receiving the pressure impulses emitted by relay 1, said amplified impulses bringing about the stoppage of the winding process, either by stopping the whole winding unit, or by disengaging the appurtenant clutch, or in a similar manner.

A detail view of the pressure difference reader 8 is shown in FIG. 5. The reader 8 contains a bellows 20 fixed on a yoke 23; the bellows changes its form (increases or decreases its length) as the pressure in the conduit 14 leading thereto changes, and thereby actuates, under cooperation of a coil compression spring 21, a movable contactor 27. The contactor 27 engages a contact 22 connected to a wire 24 when the air pressure in the conduit 14 is low, thereby establishing a circuit between a wire 15, attached to contactor 27, and wire 24. Upon a predetermined increase of pressure in conduit 14, the bellows 20 thrusts contactor 27 downwardly, thereupon opening the circuit. Wires 15 and 24 are connected to the clutch l6 inthe manner more fully shown in FIG. 6.

As shown in FIG. 4, the body of the control relay 1 is adjustably arranged on the bobbin frame 9 which carries the wound bobbin 10, the bobbin carrier being swingably arranged on the stationary carrier 11, on which a driver yarn distributor 12 is mounted. The bobbin frame 9 may be provided with a scale 26 according to which the position of the control relay 1 on the bobbin frame 9 can be accurately adjusted so that the diameter of the yarn winding [3 finally produced on the bobbin 10 may be accurately determined. A set screw 19 holds the control relay in adjusted position. The yarn distributor 12 in the embodiment shown is in the form of a driven drum upon which the surface of the winding 13 on the bobbin it) rests. Drum 12 is provided on its surface with crossed helical grooves functioning as a yarn traverse laying the yarn on the bobbin. Drum 12 is driven by a driving shaft 17 through a clutch l6 controlled by pressure difference reader 8 through the aforesaid wires and 24, drum 12 being connected to the output side of clutch 16 by a shaft 18.

The clutch I6 is shown in detail in FIG. 6. The driving part of the clutch 16 comprises a magnet body 30 with a set of inner clutch plates 31 fitting into the toothing of the magnet body 30. The driven part of the clutch 16 is formed by a set of outer clutch plates 32 and a shell 34 having a flange 35, the latter being driven by projections of the outer clutch plates 32. The clutch transmits torque when the alternating inner and outer clutch plates are clamped together by the action of an electromagnet, the latter being formed by the magnet body 30 of the clutch with a cast-in energizing coil 36. The lead-in wire of the coil 36 is soldered to a collector ring 37 and the outlet to the magnet body (ground). Wire 24 is connected to collector ring 37 by a brush 25; the outlet or grounded side of the magnet coil is connected to wire 15. The armature end-plate 39 is urged by means of spring-loaded pins 40 against the flange of the spacer sleeve. Rotary movement is imparted to the armature end-plate by two driving pins 41. The driving shaft is connected to central sleeve 42 of the clutch; the driven shaft 18 is connected to a plate (not shown) which abuts driven plate 44 of the clutch and is connected thereto by machine screws (not shown) extending through the plate connected to shaft I8 and into threaded holes 45 in plate 44.

When the clutch I6 is disengaged, the spring-loaded pins 40 urge the armature end-plate 39, which is provided with an adjusting nut, against the shoulder of the sleeve 34. At this time, the pack of clutch plates is loose. When the energizing coil 36 is supplied with current, the magnet body attracts the armature end plate 39 with its adjusting nut, so that the latter compresses the pack of clutch plates. Due to friction between the engaging clutch plates, the clutch transmits torque. When the current is cut off, the pins 40 urge the armature end-plate in the opposite direction, whereby the pack of the clutch plates is loosened, and the drive through the clutch ceases.

The above-described yarn winding stop motion functions as follows: the bobbin 10 being wound continues to increase in diameter, the yarn winding I3 at first not touching and later touching the feeler 3. Upon being engaged by the winding the feeler 3 begins to approach the discharge nozzle 2 of the control relay 1. At a certain distance, approaching the zero value, of the feeler 3 from the discharge nozzle 2 of the control relay 1, the pressure of the pressure fluid behind the diaphragm 7 increases to a value very near to that of the feeding pressure value, or equal to it, thus causing a pressure in bellows sufficient to move contactor 27 away from contact 22. This breaks the circuit 15, 24 to disconnect the clutch 16 from its source of energizing current (not shown), thereby to disengage the clutch, producing an immediate interruption of the winding process.

In certain cases the feeler 3 may be omitted, the function of the feeler 3 being then taken over directly by the surface of the wound bobbin 10; for causing the fluid pressure impulse in the control relay 1 a rather slight covering of the discharge nozzle 2 is quite sufficient.

FlG. 3 schematically illustrates the last-described embodiment. The fluid pressure control relay Ia, which is similar in construction to the relay I of FIG. 1, directly confronts the surface of the bobbin 10 being wound, the leaf spring feeler 3 of FIG. I being omitted in FIG. 3.

To produce a pressure impulse in the control relay 1 with an open discharge nozzle 2 (FIG. I), a small power acting upon the feeler 3 is sufficient; a shorttime contact of the surface of the bobbin 10 with the feeler 3, which is sufficiently wide, does not scuff the wound yarn I3, and thus does not reduce its quality. With the arrangement of the winding stop motion of FIG. I, the control relay I of which has its discharge part constantly open, there is a continuous loss of the working fluid due to its escaping through diaphragm 7 and the discharge nozzle 2 to the ambient atmosphere. Therefore it is preferable to use this winding stop motion with a low pressure fluid source, or to interpose a suitable amplifier of the pressure impulses between the control relay 1 and the pressure difference reader 8.

Parts in FIG. 2 which are the same as those of the embodiment of FIG. I are designated by the same reference characters. In the winding stop motion shown in FIG. 1, as we have seen above, pressure in line 14 increases with an increase in package or bobbin size. In the embodiment of FIG. 2, however, pressure in the line 14' decreases with an increase in bobbing size.

In FIG. 2, the discharge nozzle 2' of the relay 1 is closed by a valve element in the form of a plate or a ball 4 with a pin 5. The ball 4 bears against the seat of the discharge nozzle 2. The control relay 1' emits a pressure signal, which maintains the pneumatic control of the pressure difference reader 8 in a position to continue the winding process until the bobbin bein wound reaches a predetermined size. After the surface of the winding on bobbin 10 has engaged feeler 3 and thrust it into engagement with the pin 5, the ball 4 is thrust off its seat by means of pin 5, and thus the pressure fluid escapes around pin 5 into the ambient atmosphere.

The throttling diaphragm 7' in the inlet opening 6 produces upon escape of the pressure fluid through nozzle 2 into the ambient atmosphere, a sufficient pressure impulse for actuating the pressure difference reader 8 to stop the winding operation.

The reader 8', shown in FIG. 7, is generally similar to reader 8 shown in FIG. 5, but differs therefrom as to the arrangement of the contacts 22' which are interposed between the conductors l5 and 24. In FIG. 7 contacts 22' remain open, as there shown, until the pressure delivered to the bellows 20 through conduit 14' exceeds a predetermined desired value.

The necessary length of stroke of the pin 5 of ball 4, and the force imposed upon the pin for securing the required impulse are very small, and thus even in that case no appreciable lessening of the quality of the wound yarn 13 occurs upon contact of the surface of the wound bobbin 10 with the feeler 3.

The embodiment of the winding stop motion shown in FIG. 2, has the advantage that upon the occurrence of any appreciable disturbance in the pneumatic circuit the winding process is automatically stopped. Also, the starting of the winding process is blocked by the presence of pressure fluid in the section of conduit 14 from the control relay 1' to the difference reader 8'. The required feeding pressure of the working fluid depends upon the pressure which the difference reader 8', or a pneumatic drive for the winding unit, requires.

The relays l and 1' according to the present application, and particularly the relay 1 according to FIG. 1, has a self-cleaning power, it is not sensitive to machine vibrations or the like, and it can be easily adjusted with respect to the package, since it is disposed directly on the bobbin frame 9.

Although the invention has been illustrated and described with reference to a plurality of preferred embodiments thereof, it is to be expressly understood that it is in no way limited to the disclosure of such a plurality of embodiments, but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

l. A winding stop motion for textile machines comprising means for supporting and rotatably driving about its axis a bobbin being wound, a control relay in the form of a fluid pressure distributor having a nozzle discharging a stream of fluid toward the bobbin, a fluid pressure source connected to the relay, fluid pressure responsive means connected to the relay operated by changes in the flow of fluid from the discharge nozzle, and means operated by the fluid pressure responsive means to stop the rotation of the bobbin upon the attainment of a predetermined distance between the surface of the winding on the bobbin and the discharge nozzle of the relay as such surface and nozzle move relatively toward each other.

2. A winding stop motion according to claim 1 wherein the discharge nozzle of the relay directly confronts the surface of the winding on the bobbin.

3. A winding stop motion according to claim 1, comprising a feeler in the form of a leaf overlying the discharge nozzle, the feeler being disposed between the surface of the bobbin and the discharge nozzle, the outer surface of the winding of the bobbin engaging the feeler and thrusting it toward the discharge nozzle in the latter portion of the winding operation.

4. A winding stop motion according to claim 3, wherein the discharge nozzle is open at all times during the winding operation.

5. A winding stop motion according to claim 1 comprising a normally closed valve in the discharge nozzle, and means for opening the valve to permit the flow of fluid from the discharge nozzle upon the attainment of the winding on the bobbin of a predetermined desired diameter.

6. A winding stop motion according to claim 5, wherein the valve is a check valve having a movable valve element normally thrust against a valve seat in the body of the relay to close ths discharge nozzle, said valve element having a stem projecting toward the bobbin and adapted to be thrust away from the bobbin upon the growth of the winding on the bobbin to a predetermined diameter.

7. A winding stop motion according to claim 6, comprising a feeler in the form of a leaf spring disposed between the surface of the bobbin and the outer free end of the stem of the valve element.

8. A winding stop motion according to claim 1, comprising a frame upon which the bobbin is supported, and means for supporting the control relay upon the bobbin frame.

9. A winding stop motion according to claim 8, comprising means for adjusting the control relay toward and away from the axis of the bobbin.

10. A winding stop motion according to claim 8 comprising a feeler in the form of a leaf overlying the discharge nozzzle and interposed between the nozzle and the bobbin, and comprising means for adjusting the control relay and feeler as a whole toward and away from the axis of the bobbin. 

1. A winding stop motion for textile machines comprising means for supporting and rotatably driving about its axis a bobbin being wound, a control relay in the form of a fluid pressure distributor having a nozzle discharging a stream of fluid toward the bobbin, a fluid pressure source connected to the relay, fluid pressure responsive means connected to the relay operated by changes in the flow of fluid from the discharge nozzle, and means operated by the fluid pressure responsive means to stop the rotation of the bobbin upon the attainment of a predetermined distance between the surface of the winding on the bobbin and the discharge nozzle of the relay as such surface and nozzle move relatively toward each other.
 2. A winding stop motion according to claim 1 wherein the discharge nozzle of the relay directly confronts the surface of the winding on the bobbin.
 3. A winding stop motion according to claim 1, comprising a feeler in the form of a leaf overlying the discharge nozzle, the feeler being disposed between the surface of the bobbin and the discharge nozzle, the outer surface of the winding of the bobbin engaging the feeler and thrusting it toward the discharge nozzle in the latter portion of the winding operation.
 4. A winding stop motion according to claim 3, wherein the discharge nozzle is open at all times during the winding operation.
 5. A winding stop motion according to claim 1 comprising a normally closed valve in the discharge nozzle, and means for opening the valve to permit the flow of fluid from the discharge nozzle upon the attainment of the winding on the bobbin of a predetermined desired diameter.
 6. A winding stop motion according to claim 5, wherein the valve is a check valve having a movable valve element normally thrust against a valve seat in the body of the relay to close ths discharge nozzle, said valve element having a stem projecting toward the bobbin and adapted to be thrust away from the bobbin upon the growth of the winding on the bobbin to a predetermined diameter.
 7. A winding stop motion according to claim 6, comprising a feeler in the form of a leaf spring disposed between the surface of the bobbin and the outer free end of the stem of the valve element.
 8. A winding stop motion according to claim 1, comprising a frame upon which the bobbin is supported, and means for supporting the control relay upon the bobbin frame.
 9. A winding stop motion according to claim 8, comprising means for adjusting the control relay toward and away from the axis of the bobbin.
 10. A winding stop motion according to claim 8 comprising a feeler in the form of a leaf overlying the discharge nozzle and interposed between the nozzle and the bobbin, and comprising means for adjusting the control relay and feeler as a whole toward and away from the axis of the bobbin. 